In the process of attempting to characterize a substance, a chemist makes a number of observations? Which of the following characteristics would be classified as physical properties? Property Physical Chemical The substance is a silvery white, lustrous metal It melts at 649°C and boils at 1105°C Its density at 20°C is 1.783g/cm° The substance burns in air, producing an intense white light It reacts with chlorine to give a brittle white solid

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Q: Does each of the following describes a physical change or a chemical change? a. The helium gas…

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Q: 1. Examine each sample. Do not attempt to taste them. 2. Fill in the table below by the properties…

A: As per the guideline, Since you have posted a question with multiple sub-parts, we will solve the…

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A: Since you have posted questions with multiple sub parts, we will solve first three sub parts for…

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A: Physical change  Chemical change No change of chemical composition of matter Change in chemical…

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A: Answer: Extensive properties of a substance are the one, those depend upon the quantity of the…

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A: Since you have posted a question with multiple subparts, we will solve the first three subparts for…

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A: Since you have posted multiple questions, we are entitled to answer the first only.

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States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.